Power boat



Ap 1929.; A. s. TITCOMB POWER BOAT Filed April 25, 1926 2 Sheets-Sheet I INVENTOR. we I fe 0rd 71 7001116;

ATTORNEYS.

Patented Apr. 30, 1929.

UNITED STATES ALBERT SHEPARD TITGOMB, OF PROVIDENCE, RHODE ISLAND.

POWER BOAT.

Application filed April 23,

This invention relates to an improved construction of power boat; and has for its object to provide such a boat which will offer the minimum resistance to being propelled rapidly through or on the surface of the water.

A further object of this invention is the provision of fins or blades disposed edg ways along the opposite edges of the bottom of the boat extending from the stern forward to restrict the lateral flow of the surface water and trap the air beneath the bottom to assist in lifting the boat to plane upon the surface.

A still further object of the invention to set these blades or fins on an outwardly inclined angle to enlarge or increase the planing surface or area to further assist in lifting and supporting the boat to plane while speeding.

My invention further consists in extending the bottom surface of the boat rearwardly beyond the sterntransom to again increase the planing area and also to prevent back draft or suction of the water permitting the boat to leave the water smoothly while speeding.

A still further object of the invention is to provide a standardized type of hull that may be built at the minimum expense and in unit form, the same being preferably construeted of corrosion resisting sheet metal. The upper edges of the side walls of the hull being preferably flanged. to stiffen the same and provide a chafing stri 'r therefor and also to provide a suitable surface on which the superstrueture, of any desired design, may be supported and to which it may be readily attached, preferably by an electro welding process.

\Vith these and other objects in view, the invention consists of certain novel features of construction, as will be more fully de scribed, and particularly pointed out in the appended claims.

In the accompanying drawings:

Figure l is a perspectiw view showing the body portion of my improved inotor boat hull with one design of superstructure mounted thereon.

Figure 2 is a side elevation of the construotion shown in Figure 1. V

Figure 3 is acentral sectional elevation of the same. i

Figure 4 is a longitudinal section of the 1926. Serial N0. 104,091.

hull portion and one form of superstructure shown in dotted lines.

Figure 5 is a plan viewof the bottom of the boat showing the broad planing surface with its central eoncaved portion at the after portion formed to receive the driving propeller also showing the flaring fins or blades bending inward to vertical position at the bow. 9

Figure 6 is a stern View of the hull portron. l

Figure 7 is a bow vie-wof the hull portion.

Figure 8 is a section on line 88 of Figure 4;. p

Figure 9 is a section on line 99 of Figure 4. v

Figure 10 is a section on line 10-10 of Figure 4. V

Figure 11 shows the bottom plates as se cured to the side walls by electro welding an angle iron along the meeting edges thereof.

Figure 12 shows the outer edge of the bottom portion as turned downwardly to support and stiffen the lower flanged edge of the side walls to form the fin or blade and to be supported by this angle iron atthe inner meeting joints. 1 i

It is found in the practical construction and operation of motor boats particularly those designed to be driven at a high or moderately high rate of speed, of advantage to so construct'the hull that it will ofi'cr tlle least resistance to thcLwater through which or over which it; is forced and to" so form the bottom portion thatasthe speed increases the hull will lift to ride over or along the surface of the utor instead of through its; and to accomplish this in a simple and effective way, I have prov ded a boat which.

both fore and aft and I have formed thebot- 1 it from spreading outer escaping laterally under pressure of theweight of, the boat to assist 111 liftingtheboat tolride on the surface of the water; and the ifollowingis a detailed description of the present embodiment of my invention and showing one construction of motor boat by which these advantageous results may be accomplished Vith reference to the drawings, 10 designates the body or hull of my improved boat, the same "being preferaliily constructed of corrosion resisting sheet metal, and the edges of its metal plates connected together by an electrowelding process. This boat is preferably so shaped that the bow l1 substantially of the same width as the stern 12 thus forming side walls 13 substantially parallel with each other. The bottom 14; is preferably formed flat and its surface at the stern thus provides a broad surface 15 for supporting the boat on the surface of the water and this surface extends from the stern forward substantially to the point 16 where it is inclined slightly upward to a point 17 from which latter point it is turned more sharply upward to form the bow 18 of this hull or body portion. The middle portion of this broad bearing surface of the stern preferably grooved as at 19 to permit a free flow of water to the propeller wheel 20. which is mounted on the end of the driving shaft 21.

In order to cause the boat to leave the water smoothly and without back draft or suction, I preferably set the stern tr ,m 22 inwardly from the stern edge 23 of the bottom plates. The after ends of the side wall plates 13 also extend beyond the stern transom to further assist in preventing the water under side pressure from too readily entering the air space or pocket formed at the stern by the rapidly speeding boat.

In order to trap the air entering beneath the boat and to also prevent the free lateral movement or spreading of the supporting film of water beneath the boat, I have provided a longitudinally extending tin or blade 25 set edgeways to extend from the stern. forwardly a substantial distance along the length of the boat. 16 which is normal, and in order to provide a broader bearing and greater planing surface or area, for supporting the boat while speeding, I preferably turn the bottom edges of these lins or blades slightly outwardly or so arrange them that their inner faces are set. on

7 an incline or at an obtuse angle to the plane of the bottom surface of the boat, which arrangement when extending beyond the sides of the boat may serve to increase the supporting and planing surface of the boat and also serve to reduce the frictional resistance of the water against the sides thereof by minimizing the lateral pressure of the water against these sides.

In order to reduce the resistance of these fins in entering the water as the boat is traveling, I form their forward end portions substantially vertical as at 26, see Figures 5 and 8, back for a short distance from the bow where their lower edges begin to bend or flare outwardly as at 27, to meet the inclined portions. In other words, the forward upwardly projecting portions of these fins or blades are set vertically and the horizontally-disposed portions of the blades are set on an outward incline.

The meeting edges of the bottom plates 15 and the side wall plates of the hull are preferably elcctrowelded together; also in some instances, the side plate 13 may extend down below the bottom as shown in Figure 11, to form the lin 25, while in other instances, if desired, the bottom plate 1;") may also be turned down as at 25) in Figure 1'), to reinforce this tin 25.

In some instances in constriarting the metal hull, I turn the upper edges of the side walls outwz rdly .j at to stiffen the sides of the boat, provide a comenient protecting chafing strip therefore, and also provide a suitable edge surface for supporting the desired design of superstructure, and to which edge this superstructure may be fas toned, preferably by an clectrowelding process.

My improved construction of the sheet metal hull portion of the boat is so formed that it may be built very rapidly and at the minimum expense, the joints may be homogenetmsly connected together by an electroweldin g process thus Pl'OVltllllg a boat to all intents and purposes of one homogeneous piece easy to manufacture of stand ardized design for quantity production.

I have shown and described the planing fins as extending downwardly and outwardly beyond the side walls of the hull of the boat but I desire it to be understood that I do not limit myself to this exact arrange-- ment of these fins as their position relative to the side walls of he hull. may be varied somewhat without departing from the spirit and scope of my invention.

In some instances it is found of advantage to form the bottom of the boat of a continuous metal plate extending from how to stern; also to in. some instances form the fin or. rib integral with this bottom plate, one arrangement of which is herein illustrated at 24- in Figure 12.

The foregoing description is directed solely towards the construction illustrated, but I desire it to be understood that I reserve the privilege of resorting to all the mechanical changes to which the device is susceptible, the invention being defined and limited only by the terms of the appended claims.

I claim:

1. A motor boat having a hull of the hydroplane type formed with substantially parallel sides and a bottom surface substantially flat from the stern forward for a substantial portion of the length of the hull, and a longitudinallyalisposed fin or blade set lltl edgeways along either edge of the hull, the forward portion of the fins each being set substantially verticalwith its lower edge gradually bending outwardly as it extends rearwardly to meet said inclined disposed portion of the fin.

2. A motor boat having a hull with substantially parallel sides and a broad flat planing bottom surface at the after portion of the hull, said surface being grooved for a short distance from the stern forward, and a fin or blade of substantial depth extending from the stern along the opposite bottom edges of the hull.

ii. A motor boat having a hull with substantially parallel side walls, a stern transom and a broad fiat planing bottom surface extending rearwardly beyond said transom,

and has or blades of substantial depth extending from the stern along the opposite edges of the bottom of the hull, said fins or blades being set at an obtuse angle to the flat bottom surface of the boat to further extend its planing, the lower edge of each fin bending inwardly to substantially vertical position at the forward end thereof.

4. A motor boat hull unit formed of sheet metal and having side walls set substantially parallel throughout their length and connected by a broad fiat bottom portion, the forward portion of the bottom being turned up slightly towards the bow, said side walls being relatively narrow extending but a short distance above the normal load water line when the boat is at rest and having flanged edge portions on which any desired design of superstructure may be supported and fastened.

A motor boat hull unit formed of sheet metal with a broad flat planing bottom suriaee extending forward from the stern, turning gradually upward toward the bow of the lmat, the hull having substantially parallel relatively narrow side walls extending but a short distance above the normal load water line when the boat at rest, theupper edge of these sides being turned outwardly to provide a stiffening flange, and a support to which different desi ns of superstructures may be supported and fastened.

6. A motor boat hull unit formed of sheet 7 design of superstructure may be supported and fastened, and a longitudinally-disposed tin or blade of substantial depthset edgewise along the opposite edges of the boat.

7. A motor boat hull formed of sheet material having a bottom portion with side walls supported thereon and extending the length of the hull, said walls being relatively narrow extending but a short distance above the load water line, the upper portion of said walls being shaped to receive and support different desired designs of superstructures and to present a surface to which these superstructures may be secured.

8. A motor boat having a hull with substantially parallel sides, a broad substantially fiat planing bottom plate at the after portion of the boat anc guide fins along the opposite side edges of'the boat formed integral with said bottom plate.

9. A motor boat having a hull with sub stantially parallel sides, the bottom of the boat being formed of a single continuous metal plate extending from bow to stern and having a broad after bearing portion with the forward portion curved upwardly, and

a fin or rib formed into ral with this bottom plate and extending stern along either edge of the boat.

.ln testimony whereof I atfix my signature.

ALBERT sunrann TITOOMB.

orwardly from the 

